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Basis of Presentation and Accounting Policies - Summary of Reporting Units' Estimated Fair Values and Carrying Values, Determined as Part of Annual Goodwill Impairment Test (Details) $ in Millions | Sep. 30, 2020 USD ($)
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Southern Europe | France |
Goodwill [Line Items] |
Estimated fair values | $ 2,367.8
Carrying values | 1,320.7
Americas | United States |
Goodwill [Line Items] |
Estimated fair values | 1,194.0
Carrying values | 758.2
Americas | Other Americas | Canada |
Goodwill [Line Items] |
Estimated fair values | 153.2
Carrying values | 84.9
Right Management |
Goodwill [Line Items] |
Estimated fair values | 383.3
Carrying values | 117.9
Northern Europe | United Kingdom |
Goodwill [Line Items] |
Estimated fair values | 360.9
Carrying values | 321.5
Northern Europe | Netherlands |
Goodwill [Line Items] |
Estimated fair values | 84.5
Carrying values | $ 81.8

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